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Chapter 14: Q5CP (page 557)

Explain in detail, including diagrams, what happens when a negatively charged tape is brought near your finger.

Short Answer

Expert verified

The negatively charged tape gets attracted to the finger.

Step by step solution

01

Significance of the law of attraction

The law of attraction states that like charges repel and unlike charges attract each other. Moreover, a charged particle also attracts a neutral object.

02

Explanation of the given statement

The diagram has been drawn below-

The finger has dipoles, so when the negatively charged tape is brought near to the finger, then the electric field of the finger goes to the tape and the electric field of the tape goes to the finger which creates the attraction.

Thus, the negatively charged tape gets attracted to the finger.

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Most popular questions from this chapter

A glass sphere carrying a uniformly distributed charge of +Qis surrounded by an initially neutral spherical plastic shell (Figure 15.67).

(a) Qualitatively, indicate the polarization of the plastic. (b) Qualitatively, indicate the polarization of the inner glass sphere. Explain briefly. (c) Is the electric field at location P outside the plastic shell larger, smaller, or the same as it would be if the plastic weren’t there? Explain briefly. (d) Now suppose that the glass sphere carrying a uniform charge of +Qis surrounded by an initially neutral metal shell (Figure 15.68). Qualitatively, indicate the polarization of the metal.

e) Now be quantitative about the polarization of the metal sphere and prove your assertions. (f) Is the electric field at location P outside the metal shell larger, smaller, or the same as it would be if the metal shell weren’t there? Explain briefly.

Which of the following could be reasonable explanations for how a piece of invisible tape gets charged? Select all that apply. (1) Protons are pulled out of nuclei in one tape and transferred to another tape. (2) Charged molecular fragments are broken off one tape and transferred to another. (3) Electrons are pulled out of molecules in one tape and transferred to another tape. (4) Neutrons are pulled out of nuclei in one tape and transferred to another tape.

A point charge of 3×10−9 Cis located at the origin.

(a) What is the magnitude of the electric field at location ⟨0.2,0,0⟩ m?

(b) Next, a short, straight, thin copper wire 3 mmlong is placed along the x axis with its center at location ⟨0.1,0,0⟩ m. What is the approximate change in the magnitude of the electric field at location ⟨0.2,0,0⟩ m?

(c) Does the magnitude of the electric field at location ⟨0.2,0,0⟩ m increase or decrease as a result of placing the copper wire between this location and the point charge?

(d) Does the copper metal block the electric field contributed by the point charge?

A metal ball with diameter of a half a centimeter and hanging from an insulating thread is charged up with 1×1010excess electrons. An initially uncharged identical metal ball hanging from an insulating thread is brought in contact with the first ball, then moved away, and they hang so that the distance between their centers is 20cm.

(a) Calculate the electric force one ball exerts on the other, and state whether it is attractive or repulsive. If you have to make any simplifying assumptions, state them explicitly and justify them.

(b) Now the balls are moved so that as they hang, the distance between their centers is only 5cm. Naively one would expect the force that one ball exerts on the other to increase by a factor of 42=16, but in real life the increase is a bit less than a factor of role="math" localid="1661330186132" 16. Explain why, including a diagram. (Nothing but the distance between centers is changed—the charge on each ball is unchanged, and no other objects are around.)

You run your finger along the slick side of a positively charged tape, and then observe that the tape is no longer attracted to your hand. Which of the following are not plausible explanations for this observation? Check all that apply. (1) Sodium ions (Na+) from the salt water on your skin move onto the tape, leaving the tape with a zero (or very small) net charge. (2) Electrons from the mobile electron sea in your hand move onto the tape, leaving the tape with a zero (or very small) net charge. (3) Chloride ions (CI-) from the salt water on your skin move onto the tape, leaving the tape with a zero (or very small) net charge. (4) Protons are pulled out of the nuclei of atoms in the tape and move onto your finger.
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